Stress Analysis of Ellipsoidal Shell With Nozzle Under Internal Pressure Loading

Abstract

This paper presents the numerical procedure for the stress analysis of the intersecting shells consisting of an ellipsoidal shell and nozzle. Thin shell theory and finite element method are used. The developed special-purpose computer program SAIS is employed for elastic stress analysis of the model joints of the ellipsoidal shell with nozzle. The parametric study of the joints under internal pressure loading was performed. The results are presented in graphical form. Nondimensional geometric parameters are considered to analyze the effects of changing these parameters on the maximum effective stresses in the shells.

Junctions in shell structures: A review

“…Ellipsoidal and torispherical heads were considered. Skopinsky and Berkov [352] used a numerical procedure based on FEM and the SAIS code to formulate a new criterion for the definition of plastic limit load in nozzle connections of ellipsoidal pressure vessels. The parametric study of the joints was given.…”

Theoretical analysis of composite shell intersections

“…The form of the coordinate relations (23) depends on the shape of the intersecting shells and the angular position of the nozzle relative to the basic shell. Concrete relations for shell intersections were given in references [7] and [8].…”

“…where K ij and F i are blocks of the element stiffness matrix and the load vector respectively corresponding to the ith node at the intersection curve (blocks with a prime correspond to the nozzle coordinate system); L k is the transformation matrix for the kth node of element (in case this node does not lie at the intersection curve, the matrix L k is a unit diagonal matrix). The submatrix ë k for some shell intersections was given in references [7] and [8]. The frontal method of Irons is used to form and to solve resulting equation (12).…”

Plastic limit load of ellipsoidal pressure vessel head with nozzle under internal pressure loading

“…The elastic analysis of ellipsoidal heads with nozzles and a parametric study have been considered by Skopinsky et al (1994;2000; and in the book of Skopinsky (2008). Hsieh et al (2000; described the elastic and inelastic analyses and definition of plastic load in torispherical heads with large nozzles.…”